Loans, Major Classifications of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	$ 1,376,689		$ 1,369,445
Allowance for loan losses	5,644	$ 5,833	5,506	$ 5,828	$ 5,652	$ 5,728
Total	1,371,045		1,363,939
Loans and Leases Receivable, Net of Deferred Income	1,376,689		1,369,445
Loans and Leases Receivable, Deferred Income	937		961
Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	114,763		101,598
Allowance for loan losses	1,254	1,287	1,095	1,005	1,043	816
Loans and Leases Receivable, Net of Deferred Income	114,763		101,598
Commercial, secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	906,408		887,679
Allowance for loan losses	3,661	3,825	3,607	4,001	3,743	3,903
Loans and Leases Receivable, Net of Deferred Income	906,408		887,679
Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	317,250		335,106
Allowance for loan losses	632	625	665	666	697	837
Loans and Leases Receivable, Net of Deferred Income	317,250		335,106
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	29,566		34,291
Allowance for loan losses	72	67	105	109	122	153
Loans and Leases Receivable, Net of Deferred Income	29,566		34,291
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	8,651		10,649
Allowance for loan losses	20	18	30	36	37	28
Loans and Leases Receivable, Net of Deferred Income	8,651		10,649
Other loans, including deposit overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	51		122
Allowance for loan losses	5	$ 11	4	$ 11	$ 10	$ (9)
Loans and Leases Receivable, Net of Deferred Income	$ 51		$ 122